Socks made by Conscious Step help people, animals and the environment. The purchase of each pair works with a partner to help the environment. Socks that Give Water provides safe water for one person for 18 months thanks to water.org.These are size large which fits USA Men's 8-13, USA Women’s 9-14. The socks are made of 75% Organic Cotton, 23% Polyamide, 2% Spandex and have a seamless toe. Machine wash warm and lay flat to dry.